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N73B60 Engine - Workbook
Subject
N73B60 Engine
Objectives of the Module........................................................................ 2
Purpose of the System............................................................................3
Technical Data........................................................................................ 4
Disassembly - Components
Intake Manifold....................................................................................... 6
Cylinder Head Cover...............................................................................8
Ancillary Components and Drive Belts.................................................... 9
Cylinder Heads......................................................................................10
Valvetronic.............................................................................................11
Fuel Injectors.........................................................................................14
Lubrication Components.......................................................................15
Crankshaft and Bearings.......................................................................17
Pistons and Connecting Rods...............................................................17
Crankcase.............................................................................................19
Lubrication System................................................................................19
Cooling System.....................................................................................21
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Summary of Contents for BMW N73B60
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Page 1: Table Of Contents
Table of Contents N73B60 Engine - Workbook Subject Page N73B60 Engine Objectives of the Module................ 2 Purpose of the System................3 Technical Data..................4 Disassembly - Components Intake Manifold..................6 Cylinder Head Cover................8 Ancillary Components and Drive Belts............ 9 Cylinder Heads..................10 Valvetronic.....................11... -
Page 2: Objectives Of The Module
Objectives: After completion of this module you will be able to: • Disassemble the N73 engine. • Perform critical measurements and observations to determine engine condition. • Correctly reassemble (including valve gear timing) the N73 engine. N73B60 Engine - Diagnosis... -
Page 3: Purpose Of The System
Purpose of the System The N73 engine is a complete new BMW development from the NG Series (New Generation) as a B60 (6 liter). The N73B60 will be used in the E66 as a 760Li (USA). KT-9765 The BMW 760Li will set new standards in terms of performance and driving dynamics in the 12-cylinder market segment as well as significantly reduce fuel consumption. -
Page 4: Technical Data
2x ME 5.2 & EML IIIs with 2x HDEV ECU Emission compliance level Firing order 1-7-5-11-3-9-6-12-2-8-4-10 1-7-5-11-3-9-6-12-2-8-4-10 Fuel consumption savings compared 12 % with M73 Maxmimum regulated vehicle speed 250 / 155 250 / 155 (km/h / mph) N73B60 Engine - Diagnosis... - Page 5 Power and Torque Output - N73B60 / M73B54 Engine RPM N73B60 M73B54 N73B60 Engine - Diagnosis...
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Page 6: Intake Manifold
N N o o t t e e : : When replacing the spark plugs, it is necessary to remove the entire intake system to avoid damaging the spark plugs during installation. The spark plugs must be replaced every 100,000 miles in US vehicles. N73B60 Engine - Diagnosis... - Page 7 C C a a n n t t h h e e g g a a s s k k e e t t s s b b e e r r e e u u s s e e d d ? ? N N o o t t e e s s : : N73B60 Engine - Diagnosis...
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Page 8: Cylinder Head Cover
? ? DSC00579 N73B60 Engine - Diagnosis... -
Page 9: Ancillary Components And Drive Belts
A partial amount of engine oil will permanently bypass the oil thermostat, even when it is fully open and flows uncooled through the engine. DSC00629 The engine oil cooler helps to keep the engine oil temperature below 150 ºC. N73B60 Engine - Diagnosis... -
Page 10: Cylinder Heads
Cylinder Heads The two N73 cylinder heads are a new development from BMW and have been adapted to the new direct injection system. The cylinder heads are equipped with Valvetronic valve gear and Bi-VANOS. The inlet camshaft and the Valvetronic eccentric shaft are jointly guid- ed by a bridge support. -
Page 11: Valvetronic
N N o o t t e e : : To remove the cylinder head, it is necessary to remove the vari- able valve gear and eccentric shaft in order to gain access to the cylin- der head bolts. kt-9613 N73B60 Engine - Diagnosis... - Page 12 To remove the intermediate shaft, use the spanner tool #90 88 6 11 7 270 to unthread the locking collar (lower left). If you remove the outer snap ring (as shown lower right), the tensioning drive washer can be removed along with the tensioning ring behind it. 11 7 270 N73B60 Engine - Diagnosis...
- Page 13 W W h h a a t t s s p p e e c c i i a a l l t t o o o o l l s s ( ( n n u u m m b b e e r r s s ) ) a a r r e e r r e e q q u u i i r r e e d d f f o o r r N N 7 7 3 3 v v a a l l v v e e g g e e a a r r t t i i m m i i n n g g ? ? N73B60 Engine - Diagnosis...
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Page 14: Fuel Injectors
• Remove bolts (3), nozzle holder (4), spring washers (2) and store exactly as removed for re-installation. • Install special tool #13 1 430 and 13 5 250 on injector nozzles and drive out by slide ham- mering. N73B60 Engine - Diagnosis... -
Page 15: Lubrication Components
The filter element support dome contains an over pressure relief valve. If the filter element is blocked, this valve allows a bypass of unfiltered engine oil around the element to supply lubrica- tion to the engine. 42-02-77 N73B60 Engine - Diagnosis... - Page 16 1 1 5 5 b b a a r r . . T T h h i i s s p p r r e e v v e e n n t t s s d d a a m m a a g g e e i i n n t t h h e e o o i i l l p p u u m m p p e e s s p p e e c c i i a a l l l l y y a a t t l l o o w w o o i i l l t t e e m m p p e e r r a a t t u u r r e e s s . . • Disassemble oil pump for visual inspection. N73B60 Engine - Diagnosis...
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Page 17: Crankshaft And Bearings
The forged steel connecting rod and cap is separated by the familiar “cracked” process. The large end is angled at 30º allowing sufficient articulation in a very compact space. The pistons are cooled by oil jets spraying under the exhaust side of the piston crown. N73B60 Engine - Diagnosis... - Page 18 W W h h a a t t i i s s t t h h e e c c o o r r r r e e c c t t w w a a y y t t o o i i n n s s t t a a l l l l c c o o n n n n e e c c t t i i n n g g r r o o d d s s ( ( o o n n t t h h e e p p i i s s t t o o n n s s ) ) f f o o r r c c y y l l i i n n d d e e r r b b a a n n k k 1 1 - - 6 6 ? ? N73B60 Engine - Diagnosis...
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Page 19: Crankcase
4.0 - 8.0 Maximum oil pressure @ 20º C Oil Delivery Capacity Explanation 9 - 12 liters/minute At idle speed (550 rpm) @ 20º C 50 - 55 liters/minute At maximum engine speed (6500 rpm) @ 20º C N73B60 Engine - Diagnosis... - Page 20 • Oil jet for the drive chain (bank 7-12) • Hydraulic valve adjustment elements (HVA) • Tensioning rail for drive chain (bank 1-6) • VANOS supply • Camshaft bearings • Overhead oil tubes for the valve gear N73B60 Engine - Diagnosis...
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Page 21: Cooling System
12. Oil/water heater exchanger 19. Cylinder head, bank 1-6 6. Radiator (high temperature area) for automatic transmission 20. Heater core(s) 7. Return flow (cool) 13. Transmission oil line 21. Cylinder head, bank 7-12 8. Radiator vent line connections N73B60 Engine - Diagnosis... - Page 22 (recirculating for faster warm up). When the engine reaches operating temperature (85 ºC-110 ºC), the thermostat opens the entire cooling circuit to include the radiator. N N o o t t e e s s : : N73B60 Engine - Diagnosis...
- Page 23 C C a a u u t t i i o o n n d d u u r r i i n n g g i i n n s s t t a a l l l l a a t t i i o o n n o o f f t t h h e e w w a a t t e e r r p p u u m m p p : : The impeller is made from reinforced plastic. • Reassemble engine using your notes taken during disassembly in addition to the Repair Instructions. N73B60 Engine - Diagnosis...